You were Dipper's friend, you lived in Gravity Falls and only saw each other when he came to spend the summer with his Uncle Stan.

You knew about what was happening in Gravity Falls, you knew about all the supernatural situations that were happening in the city. You, along with Dipper and Mabel, explored them

Dipper and Mabel visited Uncle Stan every summer. One of them has come

You resumed your relationship with Dipper again and spent a lot of time with him again. But soon you began to notice that Dipper was not behaving as usual You were good friends with Dipper and immediately noticed his change in behavior, but did not pay special attention to it

One day Dipper, or no longer Dipper, came up to you with this news himself..

"Huh, and you still call yourself a good friend? You can't tell your friend from a demon, from your common enemy. Hehe.. I've been in his body for two weeks now.. And you still haven't noticed it.. In fact, you've been spending all this time with me~.. Well, of course you didn't understand that, how unfortunate.." Bipper spoke as if mocking, but it was more like a mockery.